Measured service telephone system



MEASURED SERV ICE TELEPHONE SYSTEM Filed Nov. 1926 2 Sheets-Sheet 1 M (v/440040767 4 a a J 6 0/4 GOA/746"? Im.ren IJI'- Erna Horn Nov. 5, 1929. A. HORN 1,734,729

MEASURED SERVICE TELEPHONE SYSTEM- Fild Nov. 3, 1926 2 Sheets-Sheet 2 Patented Nov. 5, 1929 AIR-NO HORN, OF BERLIN, GERMANY, ASSIGNOR TOSIEMENS &, HALSKE SELLSGHAFT, OF BERLIN, GERMANY MEASURED SERVICE TELEPHONE SYSTEM Application filed November 3, 1926, Serial No.

The present invention'relates to a circuit arrangement for a telephone coin-box station, which is adapted both for connecting to a central battery exchange and also to an automatic exchange. The circuit arrangement is so devised that calls can be made free of charge when the coin box station is called, the blocking of the circuits and of thedevice for collecting the coins is done by mechanical switching means without using special relays and power magnets allotted to the coin operated station.

The circuit is based upon idea If a coin box station is called it is brought into a condition of readiness for service immediately by lifting the receiver just as with an ordinary subscribers apparatus. The microphone receives current from the exchange battery in loop over the line a and b so that it becomes possible to conduct the speaking operations. If a call is desired from the coin box station the coin'contact must be actuated by inserting a coin in the slot, so that by grounding the coin box telephone the called signal appears in the exchange or else the preselector starts; by operating the coin contact however, the microphone is cut off from the line supplying the-voltage and is laid on to the other line, which receives potential only in certain condition of operation, for instance,'when answeringvfor the the following purpose of facilitating communication with the answering operator, or, 1n automat1c exchanges during the selection'of the 'no-delay exchange or of an operating position.

As soon as the desired connection has been established either, by the operator in manual exchanges, or by selection in automatic exchanges-and this can be verified by the answering of the called subscriber in his telephone-the payment key can be pressed so that a speaking connection can be obtained with the desired subscriber. On depressing the payment key the coin contacts are brought into normal, and consequently the microphone is again applied to the wire supplying the potential. Since the payment contact also grounds the coin box telephone station the feeding of the microphone takes place 145,924, and in Germany December 30, 1955.

AKTIENGE- over a conductor and earth. If the desired 1.

station does not reply however, then the actuation of-the payment key is omitted and the receiver hung up again. I

The switch hook in this case moves a coin channel which returns the inserted coin back to the subscriber as the connection has not been established. Moreover, by the actuation of the switch hook, the coin contacts are brought into the normal position, whereby the earth connection is cut ofl from the coin box telephone; in this manner the closing signal is given to the exchange and the supply to the microphone is disconnected.

The drawing shows two examples of the in- Vention, viz., Fig. 1 a circuit arrangement of the coin box telephone for connection to a manual central battery exchange, and Fig. 2, a circuit arrangement of the coin box telephone for connection to an automatic central battery exchange.

1. Tmfiic witk'thc manual exchange The operator in thefexchangereceives the call signal and thereupon inserts the plug of a special cord for coin box telephones, in the answering jack and after throwing overthe answering key A?) proceeds to'answer. During the time of enquiry the microphone in the coin box telephone station is supplied over the answering key so that a speaking connection with the operator is possible. 7

2. Earth, battery, answering key Ab, repeating coil-U, plug AS, jack AK, line a, switch hook contact HU coin contact U microphone M, choke coil D1, coin contact U earth.

As soon as the operator restores the answering key Ab to normal, current is disconnected from the line a, thereby rende'ringthe micro-.

' can hear the wanted subscriber answer since over the coin contact the receiver is'in the following circuit:

3. Earth, condenser, repeating coil U, plug AS, jack AK line a, switch hook HU coin contact U microphone M, receiver F, condenser C coin contact U line 6, jack AK, plug AS, supervisory relay UB repeating coil U, battery, earth.

If the desired connection has been com-' pletely established then the payment key Z is depressed so that the microphone is supplied with current. When the payment key Z gets into the operated position, then the coin contacts U to U are forcibly restored to normal and the coin is collected. Passing 2 the microphone is now supplied with current over the potential carrying line.

4. Earth, battery, repeating coil U, supervisory relay UB plug AS, jack AK, line 6, coin contact U microphone M choke coil Dr key Z, earth. o

By hanging up the receiver on the switch hook, all contacts are returned to normal,

In the case of a call to the coinbox telephone station, the "latter is made ready for service immediately by taking down the receiver from the switch hook. The microphone is then supplied in the following man- 7 ner:

5. Earth, battery, repeating coil U. supervisory relay UB connecting plug VS, connecting jack VK, line 6, coin contact U microphone M, choke coil D7 and D1, coin contact U switch hook HU line a, connecting jack VK, connecting plug VS, repeating coil U, earth.

j 11. Tmfiic with em automatic exchange 7 The circuit arrangement and mode of operation of-the coin box station (Fig.2) is 6. Earth, battery, relay R, back contact 25 relay T, in the preselector (notshown here) line a switch hook I-IU current impulse contact J K, coin contact U choke coil D1, coin contact U earth. V l

As soon as the preselector has found a free group selector the relayT of the preselector situated in the 0 wire is energized and cuts off the relay R. Relay A which is responsible for the control of thegroup selector, is

.suitably influenced by the 'actuationof the number disc (current impulse contact JK, number disc contact NK).

7. Earth, battery, relay A, preselector arm Viva, front contact t switch hook I-IU current impulse contact JK, number disc contact NK, coin contact U to earth.

l Vhen selection is completed the desired subscriber replies:

8. Repeating coil U, preselector arm VWa,

front contact 6 line a, switch hook HU cur rent impulse contact JK, coin contact U receiver F, condenser C microphone M, coin contact U*, front contact 6 preselector arm VVVb, repeating coil U.

If the desired connection has been established then the payment key Z must be depressed so that the microphone is connected to the voltage supply line. 7

9. Earth, battery,'relay A, preselector arm VvVa, front contact 6 line a, switch hook HU current impulse contact JK, coin con tact U microphone M, choke coil D1, pay ment key Z, earth.

The circuit for the speaking currents is;

10. Repeating coil U, preselector arm VWa, front contact 2?, line a, switch hook contact HU current impulse contact JK, coin contact U microphone M, condenser C receiver F, coin contact U line 6, front contact t preselector arm VVVZ), repeating coil U.

At the termination of the call all contacts are returned to normal by hanging up the receiver in the switch hook. In the case where ano-delay service exchange is connected to an automatic exchange the first group selector which is accessible to the coin box staion is provided with off-normal contacts to If, these coming into the operating position uponthe group selector reaching a particular vertical step. By this means on the one hand the signalling is passed onto the chief sender or'lice,;viz., that a coin box station requires a no-delay call (grounding of the line by the contact K and on the other hand the microphone in the coin box station is supplied over the 'ofinormal contact 70 before the payment key, is actuated, so that speaking connection is established with the chiefsenderofiice operator. If the desired connection has been established, then the payment key must be depressed in accordance with the number required by this operator.

audible signal every time the payment is actuated.

During calls free of charge with special operating places such aswith the, enquiry oilice or trouble desk, the microphone supply of the coin box telephone is likewise 0011- I trolled by front contacts k. These special places have assigned to them special calling numbers which begin with O, 9, 8, the front contact is is therefore actuated in the group selector as soon as the 8th vertical step is reached. "he microphone is then supplied in the following manner:

11. Earth, battery, relay B, front contact 13 preselector arm VI/Vb, front contact 23 line Z), coin contact U*, microphone M, choke coil Dr coin contact U earth.

If the coin box station is called, then the call may be made free of charge, the feeding of the microphone taking place as follows:

12. Earth, battery in the line selector, line a, switch hook HU current impulse contact JK, coin contact U microphone M, choke coils Dr and D7, coin contact U line b to earth in the line selector.

What is claimed is:

1. In a telephone system, a subscribers line, paystation mechanism, a transmitter and a receiver at a substation on said line, means responsive to the removal of the receiver from the hook preparatory to the initiation of a call for connecting said transmitter and receiver in a circuit including both sides of said line in series, means re sponsive to the deposition of a coin in said mechanism for opening one side of said circuit and completing a circuit over one side of the line to ground at the substation, and means controlled by the subscriber for-thereafter completing a circuit including both sides of the line in parallel to ground at the substation.

2. In a telephone system, a subscribers line including a pair of conductors terminating in an exchange, a substation on said line including an impulse sender, a transmitter and a paystationmechanism, a battery connected to one conductor of the line at the exchange, means controlled by the deposition of a coin in said mechanism for grounding the line at the substation and connecting the impulse sender to said one conductor, and means controlled by the subscriber for reversing the connection of said line to the substation to connect the transmitter to said one conductor.

3. In a telephone system, a subscribers line, paystation mechanism thereon, a substation on said line including a transmitter, one conductor of said line having battery connected thereto, means for connecting the transmitter to said one conductor, means controlled by the deposition of a coin in said mechanism for disconnecting the transmitter from said conductor, and means controlled by the subscriber for reconnecting the transmitter to said conductor.

4. In a telephone system, a subscribers line including a subscribers station, paystation IQGCllELIllSIll'OH said line, means for extending a call therefrom, means: for, prevent-I ing theextension eta call until a coin is' deposited. in said mechanism, means-con trolled by the deposition ofthe coin for opening the circuit of the transmitter atsaid station, and means controlled by the subscriber at said station for thereafter collecting said coin and completing the circuit of the transmitter.

5-. In a telephone system, a subscribers station including a transmitter, a receiver and a paystation mechanism, a pair of conductors for connecting said station with an exchange, a battery at the exchange connected to one of said conductors, and means controlled by the deposition of a coin insaid mechanism'for completing a circuit for said transmitter over said one conductor to ground at said station and for completing a circuit for the receiver over both of said conductors. 1 6 In a telephone system, a subscribers line comprising two conductors terminating in an exchange, a subscribers station on said line including a transmitter, a receiver and a paystation mechanism, said station being adapted to send and receive calls, a battery at the exchange connected to one of said conductors, means including said mechanism controlled by the subscriber for completing a circuit for the transmitter over said one conductor to ground at said station for the sending of a call, and means controlled by the subscriber for completing circuits for said transmitter and receiver over both of said conductors for the receivingof a call.

7 In a telephone system, a subscribers station including a paystation mechanism, a pair of conductors connecting said station with an exchange, means at said station for completing a talking circuit including both of said conductors for calls incoming thereto, and means at said station including said mechanism for completing a talking circuit including only one of said conductors for calls outgoing therefrom.

8. In a measured service telephone systerm, a subscribers line, a subscribers statlon on said line, a transmitter and a com collector at said station, a sourceof current connected to one conductor of said line, meansat said station operative upon the initiation of a call to connect the transmitter to said one conductor, means responsive to the'deposition of a coin at said station to disconnectthe transmitter from. said one'conductor to render the transmitter inoperative, and means for thereafter rendering the transmitter op.-

erative.

9. In a telephone system, a subscribers means for reversing the line connection at the subscribers station to disconnect the microphone from said one conductor and to opera'tively connect the impulse sender thereto, and subscriber controlled means for again reversing the line connection at the subscribers station to reconnect the microphone to said one conductor.

10. In a telephone system, a subscribers station, a microphone thereat, a line comprising a plurality of conductors connecting said station with a central exchange, coin controlled means at said station for reversing the line connection at said station to disconnect said microphone from a certain one of said conductors, and subscriber controlledmeans for again reversing said line connection to reconnect said microphone to said certain conductor. a

11. In a telephone system, a subscribers station, a tWo conductor line connecting said station With a central exchange, coin c011- trolled means for reversing the line connec tion at said station, and subscriber controlled means for again reversing said connection.

In Witness whereof, I hereunto subscribe my name this 12th day of October, A. D.

1926. ARNO HORN. 

